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High Altitude Derate
Input ratings (BTUH) of these Furnaces are based on sea level
operation and should not be changed at elevations up to 2,000 ft. (610
m).
If the installation is 2,000 ft. (610 m) or above, the Furnace input rate
(BTUH) shall be reduced 4% for each 1,000 ft. above sea level.
The Furnace input rate shall be checked by clocking the gas flow rate
(CFH) and multiplying by the heating value obtained from the local
utility supplier for the gas being delivered at the installed altitude.
Input rate changes can be made by adjusting the Manifold Pressure
(min 2.7 - max 3.0 in. W.C. - Natural Gas).
If the desired input rate can not be achieved with a change in Manifold
Pressure, then the orifices must be changed.
Turn the main Gas Valve toggle switch within the unit to the "OFF"
position. Turn the external gas valve to "ON". Purge the air from the
gas lines. After purging, check all gas connections for leaks with a
soapy solution – DO NOT CHECK WITH AN OPEN FLAME. Allow 5
minutes for any gas that might have escaped to dissipate.
18-CE15D1-1C-EN
F F u u r r n n a a c c e e G G e e n n e e r r a a l l I I n n s s t t a a l l l l a a t t i i o o n n
PART NUMBERS FOR REPLACEMENT ORIFICES
DRILL SIZE
A040 = 3.2 mm
A060 = #23
B080 = #15
C100 = #11
Note: For furnaces requiring modifications other than manifold
pressure adjustment for installation at high altitude,
installation of this furnace at altitudes above 2000 ft (610 m)
shall be made in accordance with the listed High Altitude
Conversion Kit available with this furnace.
High Altitude Kits
Attributes
0 - 4000 ft
A040
N/A
A060
N/A
B080
N/A
C100
N/A
J-TUBE PART NUMBER
TUB15871
TUB15353
TUB15443
TUB15780
4001 - 7800 ft
BAYHALTMOD0005
BAYHALTMOD0006
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BAYHALTMOD0004
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